• Darwin Archive | 'Origin of Species': portfolios I | Materials for chapter 8: 'Transition of organs' | 'Natural Selection' Portfolios, notes for chap. 8, 'Transitional varieties' | NS I Chap 8-57 Printed Material, 1865-06-10 | (extract from) 'Reader' 5: 659, 1865-06-10

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